package socket;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/**
 * 聊天室服务端
 */

public class Server {
    private ServerSocket serverSocket;
    private List<PrintWriter>allOut=new ArrayList<>();
    public Server() {
        try {
            System.out.println("正在启动服务端");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务端启动完毕！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public void start() {
        try {
            while (true) {
                System.out.println("等待客户端连接");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接了！");
                ClientHandler handler=new ClientHandler(socket);
                Thread thread=new Thread(handler);
                thread.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }
    private class ClientHandler implements Runnable{
        Socket socket;
        private String host;
        public ClientHandler(Socket socket){
            this.socket=socket;
            socket.getInetAddress().getHostAddress();
        }
        public void run(){
            PrintWriter pw=null;
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out, StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw, true);
                synchronized (allOut) {
                    allOut.add(pw);
                }
                System.out.println(host+"上线了,当前总人数:"+allOut.size());
                String message;
                while ((message = br.readLine()) != null) {
                    System.out.println(host+"说：" + message);
                    synchronized (allOut) {
                        for (PrintWriter o : allOut) {
                            o.println(host + "说" + message);
                        }
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }finally {
                synchronized (allOut) {
                    allOut.remove(pw);
                }
                System.out.println(host+"下线了，当前人数："+allOut.size());
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
